Synthesizer module

Abstract

To provide a synthesizer module that can be used not only in a destination area but also in the whole world and that can be readily set in output frequency. In the synthesizer module, a calculation formula table of a nonvolatile memory stores a plurality of frequency modes and the calculation formula of carrier frequencies corresponding to those frequency modes, and further stores, in its certain area, a frequency mode set during an initial setting of the device. A CPU, when receiving a channel number from a rotary SW during a frequency setting, calculates, based on a calculation formula corresponding to a currently set frequency mode, a carrier frequency corresponding to the channel number. This carrier frequency is set to a CONT of a PLL part.

1. A synthesizer module comprising:
 a reference clock oscillation circuit configured to generate a reference clock; 
 a voltage controlled oscillator; 
 an amplifier which amplifies an output from the voltage controlled oscillator; 
 a control section configured to generate a signal of a frequency set based on the reference clock, compare a phase of the generated signal of the set frequency with that of a signal input from the voltage controlled oscillator, and output a phase difference signal as a voltage value to the voltage controlled oscillator; 
 a switch configured to set a channel number; and 
 a central processing unit configured to output information on a frequency to be set to the control section, 
 wherein the synthesizer module further comprises: 
 a memory configured to store a plurality of frequency modes and frequency calculation formulae corresponding thereto and a frequency mode selected from outside, and 
 wherein the central processing unit reads the selected frequency mode stored in the memory and a frequency calculation formula corresponding to the frequency mode, to calculate a value of the frequency corresponding to the channel number set by the switch based on the frequency calculation formula, and outputs the value to the control section. 
 
     
     
       2. The synthesizer module according to  claim 1 , wherein
 the memory stores a value of a specific frequency, and 
 the central processing unit determines whether or not the channel number set by the switch falls within an effective range of a channel number corresponding to the selected frequency mode stored in the memory, reads, when the channel number deviates from the effective range, the value of the specific frequency from the memory and outputs the value to the control section, and reads, when the channel number is within the effective range, the selected frequency mode stored in the memory and a frequency calculation formula corresponding to the frequency mode, to calculate a value of the frequency corresponding to the channel number set by the switch based on the frequency calculation formula, and outputs the value to the control section. 
 
     
     
       3. The synthesizer module according to  claim 1 , wherein
 the central processing unit stores a value of a specific frequency and further, said central processing unit determines whether or not the channel number set by the switch falls within an effective range of a channel number corresponding to the selected frequency mode stored in the memory, outputs, when the channel number deviates from the effective range, a value of the specific frequency to the control section, and reads, when the channel number is within the effective range, the selected frequency mode stored in the memory and a frequency calculation formula corresponding to the frequency mode, to calculate a value of the frequency corresponding to the channel number set by the switch based on the frequency calculation formula, and outputs the value to the control section. 
 
     
     
       4. A synthesizer module comprising:
 a reference clock oscillation circuit configured to generate a reference clock; 
 a voltage controlled oscillator; 
 an amplifier which amplifies an output from the voltage controlled oscillator; 
 a control section configured to generate a signal of a frequency set based on the reference clock, compare a phase of the generated signal of the set frequency with that of a signal input from the voltage controlled oscillator, and output a phase difference signal as a voltage value to the voltage controlled oscillator; 
 a switch configured to set a channel number; and 
 a central processing unit configured to output information on a frequency to be set to the control section, wherein the synthesizer module further comprises: 
 a table configured to store a channel number and a value of a frequency corresponding thereto for each of frequency modes of a plurality of channels; and 
 a memory configured to store a frequency mode selected from outside, 
 wherein the memory stores a value of a specific frequency, and 
 the central processing unit reads the selected frequency mode from the memory, determines whether or not the channel number falls within an effective range of a channel number corresponding to the selected frequency mode stored in the memory, and when the channel number is within the effective range, retrieves the table based on the frequency mode and the channel number to obtain a value of a corresponding frequency, and outputs the value to the control section, and when the channel number is out of the effective range, reads the value of the specific frequency from the memory and outputs the value to the control section.